ASTM A182 F91: Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings

Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service

1. Scope
1.1 This specification covers forged low alloy and stainless steel piping components for use in pressure systems. Included are flanges, fittings, Valves, and similar parts to specified dimensions or to dimensional standards, such as the ASME specifications that are referenced in Section 2.
1.2 For bars and products machined directly from bar (other than those directly addressed by this specification; see 5.4), refer to Specifications A 479/A 479M and A 739 for the similar grades available in those specifications. Products made to this specification are limited to a maximum weight of 10 000 lb [4540 kg]. For larger products and products for other applications, refer to Specifications A 336/A 336M and A 965/A 965M for the similar ferritic and austenitic grades, respectively, available in those specifications.
1.3 Several grades of low alloy steels and ferritic, martensitic, austenitic, and ferritic-austenitic stainless steels are included in this specification. Selection will depend upon design and service requirements.
1.4 Supplementary requirements are provided for use when additional testing or inspection is desired. These shall apply only when specified individually by the purchaser in the order.
1.5 This specification is expressed in both inch-pound units and in SI units. However, unless the order specifies the applicable “M” specification designation (SI units), the material shall be furnished to inch-pound units.
1.6 The values stated in either inch-pound units or SI units are to be regarded separately as the standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.

  C Mn P S Si Ni Cr Mo V Cu Other
A182 F5 0.15 Max 0.30-0.60 0.035 Max 0.030 Max 0.50 Max 0.50 Max 4.0-6.0 0.44-0.65
A182 F9 0.15 Max 0.30-0.60 0.030 Max 0.030 Max 0.50-1.00   8.0-10.0 0.90-1.10      
A182 F11 0.10-0.20 (2) 0.40-0.65 0.025 Max 0.040 Max 0.50-0.80 1.00-1.50 0.44-0.65
A182 F22 0.05-0.15 0.30-0.60 0.035 Max 0.040 Max 0.50 Max 2.00-2.50 0.90-1.10
A182 F91 0.08-0.12 0.30-0.60 0.020 Max 0.010 Max 0.20-0.50 0.40 Max 8.0-9.5 0.85-1.05 0.18-0.25 Cb, 0.06-0.10; N, 0.03-0.07; Al, 0.04 max.

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